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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - LLDB cannot evaluate expressions on linux if inferior is stopped in a syscall" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23659&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=DDUMf06MYELAe1Nlv7KChiwJLLHbYha4jtK_AOiWqwQ&m=S7ixSAtPBK2Cnech2w9wX3RkH3ntn-Qet5jtjzceyg4&s=lAoErlEGis71a0hBX1BocndreMkptPJWew-K3F9ZwXQ&e=">23659</a>
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<th>Summary</th>
<td>LLDB cannot evaluate expressions on linux if inferior is stopped in a syscall
</td>
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<th>Product</th>
<td>lldb
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
</td>
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<th>Assignee</th>
<td>labath@google.com
</td>
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<th>Reporter</th>
<td>labath@google.com
</td>
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<th>CC</th>
<td>lldb-dev@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The inferior receives SIGILL when it tries to allocate memory.
I'm not sure how SIGILL is related, but the underlying cause is that when we do
a PTRACE_CONT to allocate the memory, the system call is restarted, whereas
what we would like to do is postpone the syscall until the expression is
evaluated. This is especially a problem if the inferior is in a blocking
syscall, which may take long (or forever, e.g. if the inferior is deadlocked)
to return.</pre>
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</p>
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